Depth selective real-time evaluation of blood flow in the tissue using Laser-Doppler-Spectroscopy

Abstract

Blood is one of the most essential parts of every living organism as it ensures the functions of the different tissue types via the Heart-Lung-System. As it can be found overall in the body it is an ideal tool for diagnosing the health of the organism if dependencies between the blood parameters and specific disease exist. To make use of this a measuring-method was developed which allows a depth selective detection of frequency-shifts based on the Laser-Doppler-Spectroscopy. Therefore a laser with a wavelength is used which in consideration of the wave length dependence of the absorption coefficient allows the largest possible tissue penetration. The measurement principle is based on the remission with spatial resolution where the frequency-shifts of the remitted photons are detected at different distances from the entering point. © 2009 Springer-Verlag.